## Journal and Conference Papers

- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
- 2013
- 2012
- 2011
- 2010
- 2009
- 2008
- 2007
- 2006
- 2005
- 2004
- 2003
- 2002
- 2001
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- 1997

- X. Wang (Jilin Univ.), N. Shinoda, Z. Ma, and M. Ohira (Saitama Univ.), "Tunable transmission-line transformer with two varactors and its application for Wilkinson power divider," Int. Journal of Electron. and Comm., vol.98, pp.259-264, Jan. 2019.
- M. Ohira, S. Hashimoto, Z. Ma (Saitama Univ.), and X. Wang (Jilin Univ.), "Coupling-matrix-based systematic design of single-DC-bias-controlled microstrip higher order tunable bandpass filters with constant absolute bandwidth and transmission zeros," IEEE Trans. on Microwave Theory and Tech., vol.67, no.1, pp.118-128, Jan. 2019.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu (Xi'an Jiaotong Univ.), X. Guan (East China Jiaotong Univ.), P. Wen (Saitama Univ./East China Jiaotong Univ.), X. Wang (Jilin Univ.), and M. Ohira (Saitama Univ.), "Miniature dual-band bandpass filter using modified quarter-wavelength SIRs with controllable passbands," Electron. Lett., vol.55, no.1, pp.38-40, Jan. 2019.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), H. Liu (Xi'an Jiaotong Univ.), Z. Ma, M. Ohira (Saitama Univ.), X. Guan (East China Jiaotong Univ.), P. Wen (Saitama Univ./East China Jiaotong Univ.), and X. Wang (Jilin Univ.), "Compact dual-band bandpass filter and diplexer using hybrid resonant structure with independently controllable dual passbands," Int. Journal of RF and Microwave Computer-Aided Eng., vol.29. no.1, e21435, Jan. 2019.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu (Xi'an Jiaotong Univ.), X. Guan (East China Jiaotong Univ.), X. Wang (Jilin Univ.), P. Wen (Saitama Univ./East China Jiaotong Univ.), and M. Ohira (Saitama Univ.), "Differential dual-band superconducting bandpass filter using multimode square ring loaded resonators with controllable bandwidths," IEEE Trans. on Microwave Theory and Tech., vol.67, no.2, pp.726-737, Feb. 2019.
- P. Wen (Saitama Univ./Xi'an Jiaotong Univ.), Z. Ma (Saitama Univ.), S. Zhu (Xi'an Jiaotong Univ.), B. Ren (Saitama Univ.), Y. Song (Xi'an Jiaotong Univ.), X. Wang (Jilin Univ.), and M. Ohira (Saitama Univ.), "Dual-band filtering power divider using dual-resonance resonators with ultrawide stopband and good isolation," IEEE Microwave and Wireless Comp. Lett., vol.29, no.2, pp.101-103, Feb. 2019.
- P. Wen (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu, S. Zhu (Xi'an Jiaotong Univ.), B. Ren (Saitama Univ./East China Jiaotong Univ.), X. Guan (East China Jiaotong Univ.), and M. Ohira (Saitama Univ.), "Individually controllable dual-band bandpass filter with multiple transmission zeros and wide stopband," IEICE Electronics Express, vol.16, no.7, pp.1-5, Mar. 2019.
- Y. He (Yokohama National Univ.), G. Macchiarella (Politecnico di Milano), Z. Ma (Saitama Univ.), L. Sun (Univ. of Science and Tech. of China,), N. Yoshikawa (Yokohama National Univ.), "Advanced direct synthesis approach for high selectivity in-line topology filters comprising N - 1 adjacent frequency-variant couplings," IEEE Access, Mar. 2019.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu (Xi'an Jiaotong Univ.), X. Guan (East China Jiaotong Univ.), P. Wen (Saitama Univ./East China Jiaotong Univ.), and M. Ohira (Saitama Univ.), "Compact multi-band differential bandpass filters using microstrip multi-moderesonators," IEEE MTT-S Int. Wireless Symp., Guangzhou, China, May 2019.
- M. Ohira, "[Invited Talk] Future Microwave Circuit Design Assisted by Neural Networks - Microwave Planar Filter Design as an Example-," Rump Session in 2019 Global Symposium on Millimeter Waves (GSMM 2019), Sendai, Japan, May 2019.
- Y. He (Yokohama National Univ.), Z. Ma (Saitama Univ.), and N. Yoshikawa (Yokohama National Univ.), "High selectivity in-line topology dual-band filters based on direct synthesis approach," Dig. of IEEE MTT-S Int. Microwave Symp., Boston, MA, June 2019.
- T. Tabei, Z. Ma, and M. Ohira, "Design of compact wideband bandstop filters using microstrip ring structures," Proc. of 2019 Thailand-Japan MicroWave (TJMW2019), Nonthabuuri, Thailand, June 2019. (Not publsihed technical report)
- M. Ohira, S. Hashimoto, and Z. Ma, "A fully reconfigurable microstrip transversal resonator array bandpass filter," Proc. of 2019 Thailand-Japan MicroWave (TJMW2019), Nonthabuuri, Thailand, June 2019. (Not publsihed technical report)
- X. Wang (Jilin Univ.), Z. Ma (Saitama Univ.), T. Xie (Jilin Univ.), M. Ohira (Saitama Univ.), C.-P, Chen (Kanagawa Univ.), and G. Lu (Jilin Univ.), "Synthesis theory of ultra-wideband bandpass transformer and its Wilkinson power divider application with perfect in-band reflection/isolation," IEEE Trans. on Microwave Theory and Tech., vol. 67, no. 8, pp. 3377-3390, Aug. 2019.

- P. Wen (Saitama Univ./East China Jiaotong Univ./Xi'an Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu, S. Zhu (Xi’an Jiaotong Univ.), B. Ren (Saitama Univ./East China Jiaotong Univ.), X. Wang, and M. Ohira (Saitama Univ.), "A miniaturized dual-band bandpass filter using composite resonators with flexible frequency ratio," IEICE Electronics Express, vol.15, no.5, pp.1-6, Feb. 2018.
- X. Wang, Z. Ma, and M. Ohira, "Theory and experiment of two-section two-resistor Wilkinson power divider with two arbitrary frequency bands," IEEE Trans. on Microwave Theory and Tech., vol.66, no.3, pp.1291-1300, Mar. 2018.
- B. Ren (Saitama Univ./China Jiaotong Univ.), H. Liu (Xi'an Jiaotong Univ.), Z. Ma, M. Ohira (Saitama Univ), P. Wen (Saitama Univ./China Jiaotong Univ.), X. Wang (Jilin Univ.), X. Guan (East China Jiaotong Univ.), "Compact dual-band differential bandpass filter using quadruple-mode stepped-impedance square ring loaded resonators," IEEE Access, vol.6, pp.21850-21858, Apr. 2018.
- M. Ohira, M. Kanomata, Z. Ma (Saitama Univ.), and X. Wang (Jilin Univ.), "A new microstrip bandstop filter for fully canonical Cul-de-Sac coupling configuration," Dig. of IEEE MTT-S Int. Microwave Symp., pp.708-711, Philadelphia, PA, June 2018.
- R. Mikase, M. Ohira, Z. Ma (Saitama Univ.), and X. Wang (Jilin Univ.), "A novel microstrip symmetric diagonal cross-coupling quadruplet bandpass filter using even/odd-mode stepped impedance resonators," Dig. of IEEE MTT-S Int. Microwave Symp., pp.712-715, Philadelphia, PA, June 2018. (R. Mikase: IMS2018 Student Paper Competition Finalist)
- M. Ohira, K. Sato, and Z. Ma, "Design of microstrip wideband filtering antenna using network synthesis theory of wideband chebyshev filter," Proc. of 2018 Thailand-Japan MicroWave (TJMW2018), Bangkok, Thailand, June 2018. (Not publsihed technical report)
- A. Yamashita, Z. Ma, and M. Ohira, "[Invited Paper] A tuning-less design method of microwave bandpass filters using neural network based inverse model," IEICE Trans. Electron. (Japanese Ed.), vol.J101-C, no.8, pp.327-335, Aug. 2018.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu (Xi'an Jiaotong Univ.), X. Guan (Saitama Univ.), P. Wen (Saitama Univ./East China Jiaotong Univ.), C. Wang (Saitama Univ./Xi'an Jiaotong Univ.), and M. Ohira (Saitama Univ.), "Balanced tri-band bandpass filter using sext-mode stepped-impedance square ring loaded resonators," IEICE Electronics Express, vol.15, no.18, p.2018670, Aug. 2018.
- X. Wang (Jilin Univ.), Z. Ma, M. Ohira (Saitama Univ.), C.-P. Chen, and T. Anada (Kanagawa Univ.), "Compact tunable Wilkinson power divider with simple structure," Proc. of 2018 Europ. Microwave Conf. (EuMC2018), pp.41-44, Madrid, Spain, Sept. 2018.
- C.-P. Chen, D. Tetsuda, Z. Zhang, T. Anada (Kanagawa Univ.), S. Takeda (Antenna Giken), Z. Ma (Saitama Univ.), and X. Wang (Jilin Univ.), Z. Ma, M. Ohira (Saitama Univ.), "Synthesis of wideband filters using single-short-circuited-stub-loaded parallel-coupled-lines," Proc. of 2018 Europ. Microwave Conf. (EuMC2018), pp.372-375, Madrid, Spain, Sept. 2018.
- M. Ohira, A. Yamashita, Z. Ma (Saitama Univ.), and X. Wang (Jilin Univ.), "[Invited] Automated microstrip bandpass filter design using feedforward and inverse models of neural network," Proc. of 2018 Asia-Pacific Microwave Conf. (APMC 2018), pp.1292-1294, Kyoto, Japan, Nov. 2018.
- P. Wen (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu, S. Zhu (Xi'an Jiaotong Univ.), M. Ohira (Saitama Univ.), C. Wang (East China Jiaotong Univ./Xi'an Jiaotong Univ.), X. Guan (East China Jiaotong Univ.), and B. Ren (Saitama Univ./East China Jiaotong Univ.), "Novel compact dual-band BPF using stub-loaded shorted stepped-impedance resonators," Proc. of 2018 Asia-Pacific Microwave Conf. (APMC 2018), pp.22-24, Kyoto, Japan, Nov. 2018.
- B. Ren (Saitama Univ./East China Jiaotong Univ.), Z. Ma (Saitama Univ.), H. Liu (Xi'an Jiaotong Univ.), M. Ohira (Saitama Univ.), X. Guan (East China Jiaotong Univ.), and P. Wen (Saitama Univ./East China Jiaotong Univ.), "Design of balanced dual-band superconducting bandpass filter with high selectivity and deep common-mode suppression," Proc. of 2018 Asia-Pacific Microwave Conf. (APMC 2018), pp.423-425, Kyoto, Japan, Nov. 2018.
- A. Song (Saitama Univ.), X. Wang (Jilin Univ.), Z. Ma, and M. Ohira (Saitama Univ.), "Design theory of dual-band Wilkinson power divider with different frequency ratio ranges," Proc. of 2018 Asia-Pacific Microwave Conf. (APMC 2018), pp.1489-1491, Kyoto, Japan, Nov. 2018.
- X. Wang, T. Xie, G. Lu (Jilin Univ.), Z. Ma, and M. Ohira (Saitama Univ.), "Authors' reply," IEEE Microwave and Wireless Comp. Lett., vol.28, no.12, pp.1158-1159, Dec. 2018.

- X. Wang, M. Ohira, and Z. Ma, "A flexible two-section transmission-line transformer design approach for complex source and real load impedances," IEICE Electronics Express, vol.14, no.1, pp.20161095, Jan. 2017.
- Y. He (Shanghai Univ.), Z. Ma (Saitama Univ.), and X. Yang (Shanghai Univ.), "A compact utral-wideband bandpass filter with broad stopband based on step-impedance stub-loaded tri-mode resonator," IEICE Electronics Express, vol.14, no.3, pp.20161214, Feb. 2017.
- T. Toda (ISAS/JAXA), N. Kukutsu, S. Kitazawa, S. Ano, H. Kamoda, T. Kumagai, K. Kobayashi (ATR), M. Ohira (Saitama Univ.), and S. Shimizu (OKI), "Intra-spacecraft wireless link and its application to spacecraft environmental tests," Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, no.ists30, vol.14, pp.21-26, Feb. 2017.
- M. Ohira, A. Yamashita, Z. Ma, and X. Wang, "A novel eigenmode-based neural network for fully automated microstrip bandpass filter design," 2017 IEEE MTT-S Int. Microwave Symp. (IMS2017), Honolulu, HI, June 2017.
- A. Yamashita, M. Ohira, Z. Ma, and X. Wang, "Design of microstrip bandpass filters using neural network based on eigenmodes," Proc. of 2017 Thailand-Japan MicroWave (TJMW2017), Bangkok, Thailand, June 2017. (Not publsihed technical report)
- S. Hashimoto, M. Ohira, Z. Ma, and X. Wang, "A fourth-order tunable bandpass filter with constant absolute bandwidth and transmission zeros," Proc. of 2017 Thailand-Japan MicroWave (TJMW2017), Bangkok, Thailand, June 2017. (Not publsihed technical report)
- M. Ohira, T. Miyazaki, Z. Ma, and X. Wang, "Coupling-matrix based design of microstrip filtering antenna with cross coupling between antenna and resonator," Proc. of 2017 Thailand-Japan MicroWave (TJMW2017), Bangkok, Thailand, June 2017. (Not publsihed technical report)
- X. Wang, Z. Ma, and M. Ohira, "Dual-band design theory for dual transmission line transformer," IEEE Microwave and Wireless Comp. Lett., vol.27, no.9, pp.782-784, Sept. 2017.
- B. Ren, Z. Ma, H. Liu, M. Ohira, P. Wen, X. Wang, and X. Guan, "Design of a compact diplexer using dual-mode microstrip and slotline resonators," 2017 6th Asia-Pacific Conf. on Antennas and Propagat. (APCAP2017), Xi'an, China, Oct. 2017.
- X. Wang, N. Kimata, Z. Ma, and M. Ohira, "Dual-band bandpass filter type Wilkinson power divider with microstrip composite resonators," Proc. of 2017 Asia-Pacific Microwave Conf. (APMC2017), Kuala Lumpur, Malaysia, Nov. 2017.
- D. Tetuda, C.-P. Chen, C. Xie, S. Kikawa, Z. Zhang, T. Anada (Kanagawa Univ.), and Z. Ma (Saitama Univ.), "Synthesis scheme of bandpass-to-all-stop switchable wideband filters based on coupled-lines," Proc. of 2017 Asia-Pacific Microwave Conf. (APMC2017), Kuala Lumpur, Malaysia, Nov. 2017.
- P. Wen, Z. Ma, H. Liu, M. Ohira, B. Ren, and X. Wang, "Compact dual-band bandpass filter using stub-loaded stepped impedance resonators with mixed electric and magnetic couplings," Proc. of 2017 Asia-Pacific Microwave Conf. (APMC2017), Kuala Lumpur, Malaysia, Nov. 2017.
- R. Tomita, M. Ohira, Z. Ma, and X. Wang, "An improved coupling-matrix extraction method of microwave bandpass filters with de-embedding technique for transmission loss of input/output lines," IEICE Trans. on Electron. (Japanese Ed.), vol.J100-C, no.12, pp.569-579, Dec. 2017.
- P. Wen (Saitama Univ./East China Jiaotong Univ.), Z. Ma, M. Ohira, X. Wang (Saitama Univ.), H. Liu (Xi’an Jiaotong Univ.), B. Ren (Saitama Univ./East China Jiaotong Univ.), and X. Guan (East China JiaoTong Univ.), "Differential dual-band filter with flexible frequency ratio using H-shaped composite resonator for SCDMA and LTE applications," Proc. of 2017 IEEE Electrical Design of Advanced Packaging and Systems (EDAPS 2017), Haining, Hangzhou, China, Dec. 2017.

- T. Hiraoka, C. Chen, T. Anada (Kanagawa Univ.), and Z. Ma (Saitama Univ.), "Proposal and design of bandpass filter with monopole modes of metallic photonic crystal point defect cavity based on coupling matrix method," IEICE Trans. Electron. (Japanese Ed.), vol.J99-C, no.2, pp.37-41, Jan. 2016.
- M. Ohira, T. Kato, and Z. Ma, "Novel microstrip realization and straightforward design of fully canonical Cul-de-Sac coupling bandpass filters," 2016 IEEE MTT-S Int. Microwave Symp., San Francisco, CA, May 2016.
- K. Sato, M. Ohira, Z. Ma, "Design of multistage microstrip filtering antenna by using parameter extraction method," Proc. of 2016 Thailand-Japan MicroWave (TJMW2016), Bangkok, Thailand, June 2016. (Not publsihed technical report)
- R. Tomita, M. Ohira, Z. Ma, "A simple and fast tuning technique for direct-coupled resonator filter design," Proc. of 2016 Thailand-Japan MicroWave (TJMW2016), Bangkok, Thailand, June 2016. (Not publsihed technical report) (TJMW2016 Young Researcher Encouragement Award)
- M. Ohira, Z. Ma, "Physical realization and systematic design of microwave bandpass filters with generalized Chebyshev function Response," Proc. of 2016 Thailand-Japan MicroWave (TJMW2016), Bangkok, Thailand, June 2016. (Not publsihed technical report)
- M. Ohira, "Microwave planar bandpass filter design for student design competition," Tutorial Session of 2016 Thailand-Japan MicroWave (TJMW2016), Bangkok, Thailand, June 2016. (Not publsihed technical report)
- X. Wang, M. Ohira, and Z. Ma, "Coupled microstrip line Wilkinson power divider with open-stubs for compensation," Electron. Lett., vol.52, no.15, pp.1314-1316, July 2016.
- Z. Ma, "Foreword," IEICE Trans. Electron., vol.E99-C, no.7, p.734, July 2016.
- M. Ohira, K. Yamanaka, and Z. Ma, "A new design formula of coupling coefficient between antenna and resonator for efficient design of filtering antenna," IEICE Trans. Electron., vol.E99-C, no.7, pp.744-750, July 2016.
- K. Dong, J. Mo, Y. He (Shanghai Univ.), Z. Ma (Saitama Univ.), and X. Yang (Shanghai Univ.), "A compact millimeter-wave dual-band bandpass filter using substrate-integrated waveguide (SIW) dual-mode cavities," IEICE Trans. Electron., vol.E99-C, no.7, pp.761-765, July 2016.
- X. Wang, M. Ohira, and Z. Ma, "Accurate Schiffman-type section design approach for microstrip line Wilkinson power divider," IEICE Electronics Express, July 2016.
- M. Ohira, T. Kato, and Z. Ma, "A fully canonical bandpass filter design using microstrip transversal resonator array configuration," IEICE Trans. Electron., vol.E99-C, no.10, pp.1122-1129, Oct. 2016.
- Z. Ma, M. Ai, M. Ohira (Saitama Univ.), C. Chen, and T. Anada (Kanagawa Univ.), "A compact quasi-millimeter-wave microstrip wideband bandpass filter," 2016 IEEE Int. Conf. on Ubiquitous Wireless Broadband, Najing, China, Oct. 2016.
- C. Chen, T. Anada (Kanagawa Univ.), S. Takeda (Antenna Giken), and Z. Ma (Saitama Univ.), "Proposal and theoretical design of THz bandpass filters using metallic photonic crystal resonators," Proc. of Europ. Microw. Conf. (EuMC 2016), Oct. 2016.
- X. Wang, M. Ohira, Z. Ma, I. Sakagami, A. Mase and M. Yoshikawa, "Capacitive/Inductive compensation factor in coupled lines Wilkinson power divider design," Microw. Opt. Tech. Lett., vol.58, no.12, pp.2940-2944, Dec. 2016.
- R. Hamano, Z. Ma, and M. Ohira, "Design of compact ultra wide-band bandpass filters using short-circuited stubs with improved stopband characteristics," IEICE Trans. Electron. (Japanese Ed.), vol.J99-C, no.12, pp.618-624, Dec. 2016.

- M. Ohira, T. Kato, and Z. Ma, "A novel microstrip filter structure consisting of transversal resonator array and its fully canonical bandpass filter design," 2015 IEEE MTT-S Int. Microwave Symp., Phoenix, AZ, May 2015.
- X. Wang (Univ. of Tsukuba), Z. Ma (Saitama Univ.), I. Sakagami (Univ. of Toyama), "A compact and harmonic suppression wilkinson power divider with general Pi type structure," 2015 IEEE MTT-S Int. Microwave Symp., Phoenix, AZ, May 2015.
- C. Chen, T. Anada (Kanagawa Univ.), Z. Ma (Saitama Univ.), S. Takeda (Antenna Giken), S. Greedy, T. Benson (Univ. of Nottingham), "A compact and harmonic suppression wilkinson power divider with general Pi type structure," 2015 IEEE MTT-S Int. Microwave Symp., Phoenix, AZ, May 2015.
- T. Toda (ISAS/JAXA), N. Kukutsu, S. Kitazawa, S. Ano, H. Kamoda, T. Kumagai, K. Kobayashi (ATR), M. Ohira (Saitama Univ.), and S. Shimizu (OKI), "Intra-spacecraft wireless link and its application to spacecraft environmental tests," 30th Int. Symp. on Space Tech. and Science, Kobe, Japan, July 2015.
- M. Ohira and Z. Ma, "On the design method of microstrip filtering antennas using only amplitude property of input reflection responses," 2015 Thailand-Japan MicroWave (TJMW2015), Bangkok, Thailand, Aug. 2015. (Not publsihed technical report)
- C. Chen, N. Kato, T. Anada (Kanagawa Univ.), S. Takeda (Antenna Giken), and Z. Ma (Saitama Univ.), "Dual-wideband BPF consisting of a parallel-coupled SIR and open-ended stubs with transmission zeros," 2015 European Microwave Conf., Paris, France, Sep. 2015.
- M. Ohira and Z. Ma, "An efficient design method of microstrip filtering antenna suitable for circuit synthesis theory of microwave bandpass filters," 2015 Int. Symp. on Antennas and Propagat. (ISAP2015), pp.846-849, Hobart, Australia, Nov. 2015.
- C.-P. Chen, T. Hiraoka, N. Kato, T. Anada (Kanagawa Univ.), S. Takeda (Antenna Giken), Z. Ma (Saitama Univ.), "New modeling of three-coupled-lines and its application to wideband filters," 2015 Asia-Pacific Microwave Conf. (APMC 2015), Nanjing, China, Dec. 2015.
- X. Wang (Tsukuba Univ.), Z. Ma (Saitama Univ.), I. Sakagami (Univ. of Toyama), M. Yoshikawa (Tsukuba Univ.), A. Mase (Kyushu Univ.), "Wilkinson power divider with band-pass filter response and easy structure," 2015 Asia-Pacific Microwave Conf. (APMC 2015), Nanjing, China, Dec. 2015.

- M. Ohira, H. Aoyama, and Z. Ma, "Physical interpretation of frequency-dependent S/L coupling in multi-mode bandpass filter and its design approach for generation of multiple finite transmission zeros," 2014 IEEE MTT-S Int. Microwave Symp., Tampa, FL, June 2014.
- Y. Yan (Saitama Univ./Xidian Univ.), X. Zhao, Y. Zhang, C. Liang (Xidian Univ.), and Z. Ma (Saitama Univ.), "Parallel computation of complex antennas around the coated object using iterative vector fields technique," IEICE Trans. Electron., vol.E97-C, no.7, pp.661-669, July 2014.
- M. Ohira (Saitama Univ.), S. Ano, S. Kitazawa, H. Ban, N. Kukutsu, and K. Kobayashi (ATR), "Microwave propagation characterization in automotive engine compartment for wireless harness communications," IEEE AP-S Int. Symp. Antennas Propagat. Dig. (APS 2014), pp.1179-1180, Memphis, TN, July 2014.
- Z. Ma, Y. Wang, M. Ohira (Saitama Univ.), C.-P. Chen, and T. Anada (Kanagawa Univ.), "Design of a quasi-millimeter-wave UWB bandpass filter using microstrip dual-mode ring resonator and half-wavelength resonators," The XXXI General Assembly of the International Union of Radio Science (URSI GASS 2014), Beijing, China, Aug. 2014.
- Z. Yang (Shanghai Univ.), Z. Ma (Saitama Univ.), L. Zhang, and X. Yang (Shanghai Univ.), "A novel miniature ultra-wideband microstrip filter using a short-ended interdigital coupled-line unit," 2014 IEEE Int. Symp. on Radio Frequency Integration Tech. (RFIT 2014), Hefei, China, Aug. 2014.
- M. Ohira, "A parameter-extraction method for transversal resonator array bandpass filters and its applications to multi-mode filter designs," Workshop WS1D in 2014 Asia-Pacific Microwave Conf. (APMC 2014), Sendai, Japan, Nov. 2014.
- Z. Ma, "Basic Theory and Practice in Microwave Filter Designs," Short Course SC2F in 2014 Asia-Pacific Microwave Conf. (APMC 2014), Sendai, Japan, Nov. 2014.
- J. Nakatsutsumi, Y. Kobayashi, and Z. Ma, "Discussions on measurement accuracy of complex relative permittivity using a balanced-type circular disk resonator method," Proc. of Asia-Pacific Microwave Conf. (APMC 2014), pp.522-524, Sendai, Japan, Nov. 2014.
- J. Tsurumi, Z. Ma, and M. Ohira, "Microstrip lowpass filters with improved frequency responses using coupled-line hairpin resonators," Proc. of Asia-Pacific Microwave Conf. (APMC 2014), pp.1154-1156, Sendai, Japan, Nov. 2014. (APMC 2014 Student Prize)

- M. Ohira and Z. Ma, "A parameter-extraction method for microwave transversal resonator array bandpass filters with direct source/load coupling," IEEE Trans. Microwave Theory and Tech., vol.61, no.5, pp.1801-1811, May 2013.
- M. Ohira and Z. Ma, "Circuital modeling and physical understanding of dissipation effects for coupled resonator filters transformed into transversal array configuration," Proc. of 2013 Int. Symp. on Electromagnetic Theory (EMTS 2013), pp.53-56, Hiroshima, Japan, May 2013.
- M. Ohira, H. Aoyama, and Z. Ma, "Deterministic extraction of direct source/load coupling and its application to multi-mode filter designs based on transversal array network theory," 2013 IEEE MTT-S Int. Microwave Symp., Seattle, WA, June 2013.
- H. Ishii (Yamagata Univ.), T. Kimura (Saitama Univ.), N. Kobayashi, A. Saito (Yamagata Univ.), Z. Ma (Saitama Univ.), and S. Ohshima (Yamagata Univ.), “Development of UWB HTS bandpass filters with microstrip stubs-loaded three-mode resonator," IEEE Trans. on Applied Superconductivity, vol. 23, no. 3, June 2013.
- M. Ohira, "A bandwidth-enhanced low-profile antenna for in-machine wireless harness communications and its clearance distance evaluation," IEEE AP-S Int. Symp. Antennas Propagat. Dig., pp.978-979, Orlando, FL, July 2013.
- Y. Yan, X. Zhao, Y. Zhang, C. Liang, J. Mo (Xidian Univ.), and Z. Ma (Saitama Univ.), “Parallel computation of complex antennas around the coated object using hybrid higher-order MoM and PO technique,” Proc. of Int. Symp. on Antennas and Propagat., pp.791-794, Nanjing, China, Oct. 2013.
- M. Ohira, T. Matsumoto, and Z. Ma, “A cutoff-waveguide bandpass filter using antiresonant elements for sharp passband skirt and wide stopband characteristics,” Proc. of Asia-Pacific Microwave Conf., pp.447-449, Seoul, Korea, Nov. 2013.
- H. Aoyama, M. Ohira, and Z. Ma, “A design method of multi-mode filters with transmission zeros using synthesis theory and parameter extraction technique for transversal array network,” IEICE Trans. on Electron. (Japanese Ed.), pp.471-479, vol.J96-C, no.12, Dec. 2013. (in Japanese)
- T. Matsumoto, M. Ohira, and Z. Ma, “Improvement on stopband property of compact waveguide filters using hybrid resonances and antiresonances of cutoff waveguides and planar resonators,” IEICE Trans. on Electron. (Japanese Ed.), pp.524-532, vol.J96-C, no.12, Dec. 2013. (in Japanese)
- M. Ohira and Z. Ma, "Authors' Reply," IEEE Trans. Microwave Theory and Tech., vol.61, no.12, pp.4284-4285, Dec. 2013.

- M. Ohira (Saitama Univ.), A. Miura (NICT), M. Taromaru (Fukuoka Univ.), and M. Ueba (Muroran Inst. Tech.), "Efficient gain optimization techniques for azimuth beam/null steering of inverted-F multiport parasitic array radiator (MuPAR) antenna," IEEE Trans. Antennas Propagat., vol.60, no.3, pp.1352-1361, Mar. 2012. (IEEE AP-S Japan Chapter Young Engineer Award)
- M. Ohira and Z. Ma, "Novel multi-mode ring resonator transversal array bandpass filter with very high skirt selectivity using multiple transmission zeros," 2012 IEEE MTT-S Int. Microwave Symp. (IMS 2012), Montreal, Canada, June 2012.
- C. Chen, J. Oda, T. Anada (Kanagawa Univ.), Z. Ma (Saitama Univ.), S. Takeda (Antenna Giken Co., Ltd.), "Theoretical design of wideband filters with attenuation poles using improved parallel-coupled three-line units," 2012 IEEE MTT-S Int. Microwave Symp. (IMS 2012), Montreal, Canada, June 2012.
- Z. Yang, L. Zhang (Shanghai Univ.), Z. Ma (Saitama Univ.), X. Yang (Shanghai Univ.), "Design of a compact dual-band dual-mode microstrip filter with an adjustable transmission zero," 2012 IEEE MTT-S Int. Microwave Symp. (IMS 2012), Montreal, Canada, June 2012.
- M. Ohira and Z. Ma, "Resonant-mode characteristics of a new three-mode hybrid microstrip/slotline resonator and novel realization of compact bandpass filter with four transmission zeros," IEICE Trans. Electron., vol.E95-C, no.7, pp.1203-1210, Jul. 2012.
- M. Ohira, "Genetic Algorithm Design for Applications to Microwave Filters and Antennas," TJMW2012 (Thailand-Japan MicroWave) Microwave Theory and Techniques Tutorial, pp.87-104, Bangkok, Thailand, Aug. 2012.
- Z. Ma, M. Ohira (Saitama Univ.), C.-P. Chen, and T. Anada (Kanagawa Univ.), "A novel compact high-performance microstrip 26GHz ultra-wideband (UWB) bandpass filter for vehicle radar systems," IEEE MTT-S Int. Microw. Workshop Series on Millimeter Wave Wireless Tech. and Applications (IMWS2012), Sep. 2012.
- M. Ohira and Z. Ma, "Compact bandpass filter with a sharp roll-off response using multi-path coupling scheme of H-shaped resonator," Proc. of Asia-Pacific Microwave Conf., pp.1130-1132, Kaohsiung, Taiwan, Dec. 2012.
- C. Chen, J. Oda, Y. Kamiji, T. Anada (Kanagawa Univ.), and Z. Ma (Saitama Univ.), "Theoretical/synthesis design of compact UWB bandpass filters with very sharp roll-off characteristics," Proc. of Asia-Pacific Microwave Conf., pp.112-114, Kaohsiung, Taiwan, Dec. 2012.

- M. Tsuji, H. Deguchi (Doshisha Univ.), and M. Ohira (Saitama Univ.), "A new frequency selective window for constructing waveguide bandpass filters with multiple attenuation poles," Progress In Electromagnetics Research C, vol. 20, pp. 139-153, 2011.
- M. Ohira, Z. Ma, and M. Kato,"Resonant-mode behavior of a new slotline-embedded three-mode microstrip-line resonator and its filter application," Proc. of 2011 China-Japan Joint Microwave Conf., pp.326-329, Hangzhou, China, Apr. 2011. (Microwave Prize)
- Z. Ma, M. Ohira, T. Hotaka (Saitama Univ.), C.-P. Chen, T. Anada (Kanagawa Univ.), and Y. Kobayashi (Saitama Univ.), "Characteristics and design formulas of a microstrip stub-loaded multi-mode ring resonator," Proc. of 2011 China-Japan Joint Microwave Conf., pp.354-357, Hangzhou, China, Apr. 2011.
- C.-P. Chen, J. Takahashi, R. Iinuma, Y. Kamiji (Kanagawa Univ.), Z. Ma (Saitama Univ.), and T. Anada (Kanagawa Univ.), "Design of UWB Filter with SIRs and Parallel-Coupled Three Lines," Proc. of 2011 China-Japan Joint Microwave Conf., pp.362-365, Hangzhou, China, Apr. 2011.
- Z. Yang, L. Zhang (Shanghai Univ.), Z. Ma (Saitama Univ.), and X. Yang (Shanghai Univ.), "A compact microstrip dual-mode dual-band filter with source-load coupling," Proc. of 2011 China-Japan Joint Microwave Conf., pp.382-385, Hangzhou, China, Apr. 2011.
- M. Ohira and Z. Ma, "Eigen-mode analysis of a novel three-mode microstrip/slot-line resonator and the development of a compact bandpass filter with multiple transmission zeros and wide stopband property," 2011 IEEE MTT-S Int. Microwave Symp. (IMS 2011), Baltimore, MD, June 2011.
- Z. Ma, A. Beppu (Saitama Univ.), C.-P. Chen, and T. Anada (Kanagawa Univ.), "Design of an UWB Bandpass Filter Using a Microstrip Five-mode Step-impedance Resonator," 2011 Progress In Electromagnetics Research Symposium (PIERS 2011), Suzhou, China, Sept. 2011.
- M. Ohira, Z. Ma (Saitama Univ.), H. Deguchi, and M. Tsuji (Doshisha Univ.), "A novel feeding structure to generate multiple transmission zeros for miniature waveguide bandpass filters composed of frequency-selective surfaces," IEICE Trans. Electron., vol.E94-C, no.10, pp.1586-1593, Oct. 2011.
- M. Ohira (Saitama Univ.), H. Ban (ATR), and M. Ueba (ATR/Muroran Inst. Tech.), "Evolutionary generation of subwavelength planar element loaded monopole antenna," IEEE Antennas and Wireless Propagat. Lett., vol.10, pp.1559-1562, Nov. 2011.
- M. Ohira (Saitama Univ.), T. Umaba (ATR/Mitsubishi Elec. Corp.), S. Kitazawa, H. Ban (ATR) and M. Ueba (ATR/Muroran Inst. Tech.), “Experimental characterization of microwave radio propagation in ICT equipment for wireless harness communications,” IEEE Trans. Antennas Propagat., vol.59, no.12, pp.4757-4765, Dec. 2011.
- M. Ohira, T. Matsumoto, Z. Ma (Saitama Univ.), H. Deguchi, and M. Tsuji (Doshisha Univ.), "A new type of compact evanescent-mode waveguide bandpass filter using planar dual-bahavior resonators," Proc. of Asia-Pacific Microwave Conf., pp.1023-1026, Melbourne, Australia, Dec. 2011.
- Z. Ma, T. Kimura, M. Ohira (Saitama Univ.), C.-P. Chen, and T. Anada (Kanagawa Univ.), "Design of a broadband bandpass filter using microstrip stubs-loaded three-mode resonator," Proc. of Asia-Pacific Microwave Conf., pp.139-142, Melbourne, Australia, Dec. 2011.
- Y. Kamiji, C.-P. Chen, T. Anada (Kanagawa Univ.), and Z. Ma, (Saitama Univ.), "Numerical study on transmission characteristics of photonic crystal waveguides for submillimeter and terahertz frequency applications," Proc. of Asia-Pacific Microwave Conf., pp.1722-1725, Melbourne, Australia, Dec. 2011.

- C.-P. Chen, J. Takahashi (Kanagawa Univ.), Z. Ma (Saitama Univ.), T. Anada, J.-P. Hsu (Kanagawa Univ.), "Design of pseudo-elliptical wideband bandpass filter using stub loaded short-circuited parallel-coupled three-line units," IEICE Transaction on Electronics, vol.E93-C, no. 7, pp. 1022-1031, Jul. 2010.
- H. S. M. Nazarat, Y. Kobayashi, Z. Ma, "Frequency dependence measurements of complex permittivity of dielectric plates using TE0m1 modes in a circular cavity," IEICE Transaction on Electronics, vol.E93-C, no. 7, pp. 1126-1131, Jul. 2010.
- Z. Ma, H. Sasaki (Saitama Univ.), C.-P. Chen, T. Anada (Kanagawa Univ.), and Y. Kobayashi (Saitama Univ.), "Design of a wideband bandpass filter using microstrip parallel-coupled dual-mode ring resonator," 2010 Asia-Pacific Microwave Conference Proceedings, pp. 21-24, WE1B-01, Dec. 2010.
- S. Wadayama, Y. Kobayashi, and Z. Ma, "Discussions on microwave measurement of permittivity anisotropy in the plane of dielectric laminate substrates," 2010 Asia-Pacific Microwave Conference Proceedings, pp. 1773-1776, FR3C-3, Dec. 2010.
- S. Kaneko (Saitama Univ.), H. Kawabata (Gunma Industrial Technology Center), and Y. Kobayashi (Saitama Univ.), "Improved perturbation method of complex permittivity using correction charts for TM010 and TM020 modes of a circular cylindrical cavity," 2010 Asia-Pacific Microwave Conference Proceedings, pp. 1448-1451, TH3G-47, Dec. 2010.
- H. Kawabata (Gunma Industrial Technology Center), Y. Kobayashi, and S. Kaneko (Saitama Univ.), "Analysis of cylindrical cavities to measure accurate relative permittivity and permeability of rod samples," 2010 Asia-Pacific Microwave Conference Proceedings, pp. 1459-1462, TH3G-50, Dec. 2010.
- M. Ohira, Z. Ma (Saitama Univ.), H. Deguchi, and M. Tsuji (Doshisha Univ.), "A novel coaxial-excited FSS-loaded waveguide filter with multiple transmission zeros," 2010 Asia-Pacific Microwave Conference Proceedings, pp. 1720-1723, FR2F-03, Dec. 2010.

- C. P. Chen, Z. Ma, and T. Anada, "Synthesis of Ultra-Wideband Bandpass Filter Employing Parallel Coupled Stepped-Impedance Resonators," IET Microw. Antennas Proag., Vol. 2, No. 8, pp. 766-772, Dec. 2008.
- P. Cai, Z. Ma, H. Kanzaki, Y. Zhang, and B. Chen, "Millimeter-Wave Ultra-Wideband Bandpass Filter Employing Dual-Mode Ring Resonators Fed by Step-Impedance Coupled Lines," J Infrared Milli Terahz Waves, Vol. 30, No. 2, pp. 432-438, Feb. 2009.
- W. He, Z. Ma, C. P. Chen, T. Anada, and Y. Kobayashi, "A Compact Dual-Band Bandpass Filter Using Stub-Loaded Two-Mode Resonators and Direct Source-Load Coupling to Obtain Improved Stopband Characteristics," Microwave and Optical Technology Letters, Vol. 51, No. 3, pp. 618-621, Mar. 2009.
- Xuehui Guan, Zhewang Ma, and Peng Cai, "A Novel Triple-Band Microstrip Bandpass Filter for Wireless Communication," Microwave and Optical Technology Letters, John Wiley, Vol. 51, No. 6, pp. 1568-1569, June 2009.
- Chun-Ping Chen, Zhewang Ma, Yoshinori Takakura, Hiroshige Nihei, and Tetsuo Anada, "Novel Wideband Bandpass Filter Using Open-Ended Stub Loaded Parallel Coupled Short-Circuited Three-Line Unit," 2009 IEEE MTT-S Int. Microwave Symp. Dig., pp. 725-728, June 6-12, 2009.
- Hiroshige Nihei, Yoshinori Takakura, Chun-Ping Chen, Tetsuo Anada, and Zhewang Ma, "Pulse Propagation in Photonic Crystal Multimode Interference Waveguides Using Time Domain Beam-Propagation Method," 2009 IEEE MTT-S Int. Microwave Symp. Dig., TUPC-4, pp. 321-324, June 6-12, 2009.
- Peng Cai, Zhewang Ma, and Hitoshi Kanzaki, "A Wideband Quasi-Millimeter-Wave Bandpass Filter Using Dual-Mode Resonator with 5/4 Wavelength Folded Stubs," Microwave and Optical Technology Letters, John Wiley, Vol. 51, No. 7, pp. 1708-1711, July 2009.
- Koji Watanabe, Zhewang Ma, Chun-Ping Chen, and Tetsuo Anada, "An Ultra-Wide Band Bandpass Filter Having Sharp Skirt Property and Large Attenuations In Its Stopband," Microwave and Optical Technology Letters, John Wiley, Vol. 51, No. 9, pp. 2093-2097, Sept. 2009.
- Zhewang Ma, Wenqing He, Chun-Ping Chen, and Tetsuo Anada, "Miniaturized High-Performance UWB Bandpass Filter Consisting of Only One Microstrip Three-Mode Resonator," Proceedings of the 39th European Microwave Conference, EuMC16-2, pp.303-306, Sept. 30, 2009.
- Yoshinori Takakura, Hiroshige Nihei, Chun-Ping Chen, Tetsuo Anada, and Zhewang Ma, "An Efficient Beam-Propagation Method for Pulse Propagation Modelling of Photonic Crystal MMI Devices," Proceedings of the 39th European Microwave Conference, EuMCPoster03-30, pp.1563-1566, Oct. 1, 2009.
- Wenqing He, Zhewang Ma, Chun-Ping Chen, and Tetsuo Anada, "A Novel Compact Bandpass Filter Using a Novel Microstrip Three-Mode Resonator Obtaining Low Loss and Sharp Attenuation," Microwave and Optical Technology Letters, John Wiley, Vol. 51, No. 11, pp. 2547-2551, Nov. 2009.
- Hossain S. M. Nazarat, Yoshio Kobayashi, and Zhewang Ma, "Frequency Dependence Measurements of Complex Permittivity of a Dielectric Plate by Using TE0m1 Modes in a Circular Cavity," 2009 Asia-Pacific Microwave Conference Proceedings (CD-ROM), TH3H-4, Dec. 8, 2009.
- Chun-Ping Chen, Yoshinori Takakura, Hiroshige Nihei, Zhewang Ma, and Tetsuo Anada, "Design of Compact Notched UWB Filter Using Coupled External Stepped-Impedance Resonator," 2009 Asia-Pacific Microwave Conference Proceedings (CD-ROM), WE4C-3, Dec. 9, 2009.
- Yusuke Omote, Zhewang Ma, and Futoshi Kuroki, "Representation of Immittance Inverter Networks in Asymmetrical Reactance Circuits and Its Applications to BIT Line Band-pass Filter Fed by Coaxial Cables," 2009 Asia-Pacific Microwave Conference Proceedings (CD-ROM), TH3C-1, Dec. 10, 2009.
- Zhewang Ma, Chun-Ping Chen, and Tetsuo Anada, "New Progress in the Development of Compact High-Performance Microwave Ultra-Wideband (UWB) Filters," (Invited) Proceedings of 2009 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT2009), FR3B-1, pp. 355-360, Dec. 11, 2009.

- Xuehui Guan, Zhewang Ma, Peng Cai, Tetsuo Anada, and Gen Hagiwara, "A microstrip dual-band bandpass filter with reduced size and improved stopband characteristics," Microwave and Optical Technology Letters, John Wiley, Vol. 50, No. 3, pp. 618-620, Mar. 2008.
- C. P. Chen, Z. Ma, and T. Anada, "Synthesis of UWB Bandpass Filter by Multistage of One-Wavelength Commensurate SIRs," 2008 International Conference on Microwave and Millimeter Wave Technology Proceedings, I24A2-01, pp. 1247-1250, Apr. 2008.
- Z. Ma, T. Shimizu, Y. Kobayashi, T. Anada, and G. Hagiwara, "Design and Implementation of Microwave Dual-Band Bandpass Filters Using Microstrip Composite Resonators," Microwave and Optical Technology Letters, Vol. 50, No. 6, pp. 1628-1632, June 2008.
- Z. Ma, W. He, C. P. Chen, Y. Kobayashi, and T. Anada, "A Novel Compact Ultra-Wideband Bandpass Filter Using Microstrip Stub-Loaded Dual-Mode Resonator Doublets," 2008 IEEE MTT-S Int. Microwave Sym. Dig., WE3A-02, pp. 435-438, June 2008.
- H. Nihei, C. P. Chen, T. Anada, and Z. Ma, "Time-Domain FD-BPM for Calculating Pulse Propagation Properties of MMI Device with Photonic Crystal Structure," Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.1, pp. 9-12, Sept. 2008.
- C. P. Chen, Z. Ma, T. Anada, P. Cai, and N. Nagaoka, "Recent Progress in Synthesis Techniques of Microwave Ultra-Wideband (UWB) Filter," (Invited Paper) Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.1, pp. 88-94, Sept. 2008.
- W. He, Z. Ma, C. P. Chen, and T. Anada, "Doublet Modular for Design of Microwave Filters," Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.2, pp. 367-370, Sept. 2008.
- K. Watanabe, Z. Ma, C. P. Chen, T. Anada, M. Kato, and Y. Kobayashi, "Design of a Microstrip UWB Bandpass Filter Having Sharp Attenuations and Wide Stopbands," Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.2, pp. 391-395, Sept. 2008.
- R. Yoshitomi, Y. Kobayashi, Z. Ma, and M. Kato, "Calculation of Transmission Characteristics in Microstrip and Coplanar Lines Using Copper-Clad Glass Cloth Dielectric Laminate Substrates," Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.2, pp. 710-713, Sept. 2008.
- C. P. Chen, N. Nagaoka, Z. Ma, and T. Anada, "Synthesis of Ultra-Wideband (UWB) Bandpass Filter with High Performance," Proceedings of 2008 China-Japan Joint Microwave Conference, Vol.2, pp. 363-366, Sept. 2008.
- C. P. Chen, Z. Ma, T. Anada, and J.P. Hsu, "Determination of Wave Propagation Properties for Multilayered Dielectric Waveguide by Semivectorial Beam Propagation Method with Douglas Scheme," Microwave and Optical Technology Letters, Vol. 50, No. 10, pp. 2521-2524, Oct. 2008.
- C. P. Chen, Z. Ma, N. Nagaoka, and T. Anada, "Synthesis/Design of Novel Compact Ultra-wideband Bandpass Filter with Very Steep Skirt Selectivity," Proceedings of the 38th European Microwave Conference, EuMC44-3, pp.849-852, Oct. 2008.
- C. P. Chen, Z. Ma, and T. Anada, "Synthesis of Ultra-Wideband Bandpass Filter by Multi-Section of Commensurate Stepped-Impedance Resonators," Microwave and Optical Technology Letters, Vol. 50, No. 10, pp. 2635-2639, Oct. 2008.
- K. Kikuchi, Z. Ma, and T. Anada, "A New Design Method of Microstrip Dual-Band Bandstop Filters," Microwave and Optical Technology Letters, Vol. 50, No. 11, pp. 2888-2892, Nov. 2008.
- C. P. Chen, Z. Ma, and T. Anada, "Novel Compact Ultra-Wideband Bandpass Filter by Application of Short-Circuited Stubs and Stepped-Impedance-Resonator," IEICE Trans. Electron., Vol.E91-C, No.11, pp. 1786-1792, Nov. 2008.
- X. Guan, Z. Ma, and P. Cai, "A Novel Compact Bandpass Filter with a Triple-Passband Response," 2008 Asia-Pacific Microwave Conference Proceedings, B4-09, Dec. 2008.
- W. He, Z. Ma, C. P. Chen, T. Anada, and Y. Kobayashi, "A Novel Dual-Band Bandpass Filter Using Microstrip Stub-Loaded Two-Mode Resonators with Source and Load Coupling," 2008 Asia-Pacific Microwave Conference Proceedings, B4-11, Dec. 2008.
- C. P. Chen, H. Nihei, Z. Ma, T. Anada, and D. Xu, "Synthesis of Ultra-Wideband Bandpass Filter Prototype with Multi-Stage SIRs and Short-Circuited Stubs Loaded at Ports," 2008 Asia-Pacific Microwave Conference Proceedings, E4-07, Dec. 2008.
- K. Watanabe, Z. Ma, C. P. Chen, T. Anada, and Y. Kobayashi, "A Microstrip UWB Bandpass Filter Using a Stub-Loaded Dual-Mode Ring Resonator and a Step Impedance Two-Mode Resonator," 2008 Asia-Pacific Microwave Conference Proceedings, E4-10, Dec. 2008.
- H. Nakai, Y. Kobayashi, and Z. Ma, "Wide-Band Measurements for Frequency Dependence of Complex Permittivity of a Dielectric Rod Using Multi-mode TM0m0 Cavities," 2008 Asia-Pacific Microwave Conference Proceedings, J4-08, Dec. 2008.

- Zhewang Ma, Peng Cai, Xuehui Guan, Yoshio Kobayashi, and Tetsuo Anada, "A Novel Millimeter-Wave Ultra-Wideband Bandpass Filter Using Microstrip Dual-Mode Ring Resonators Loaded with Open Tuning Stubs of Different Lengths," 2007 IEEE MTT-S Int. Microwave Sym. Dig., WE3E-03, pp. 743-746, June 2007.
- Peng Cai, Zhewang Ma, Xuehui Guan, Yoshio Kobayashi, Tetsuo Anada, and Gen Hagiwara, "A Novel Compact Ultra-Wideband Bandpass Filter Using a Microstrip Stepped-Impedance Four-Modes Resonator," 2007 IEEE MTT-S Int. Microwave Sym. Dig., WE3E-05, pp. 751-754, June 2007.
- Chun-Ping Chen, Zhewang Ma, Tetsuo Anada, Jui-Pang Hsu, and Deming Xu, "Measurement of Surface EM Field of Planar Circuit in Microwave Frequency," Proc. of IEEE 2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, pp. 1315-1318, August 14-16, 2007.
- Chun-Ping Chen, Deming Xu, Zhewang Ma, Tetsuo Anada, "Further Study on Coaxial-Probe- Based Two-Thickness-Method for Nondestructive and Broadband Measurement of Complex EM-parameters of Absorbing Material", IEICE Trans. Electron., Vol.E90-C No.94, pp.1763-1769, Sept. 2007.
- Chun-Ping Chen, Kohei Sugawara, Zhewang Ma, Tetsuo Anada, and D. W. Tomas, "Compact Magnetic Loop Probe for Microwave EM Field-Mapping and Its Applications in Dielectric Constant Measurement," Proceedings of the 37th European Microwave Conference, EuMC12-4, pp.226-229, Oct. 2007.
- Chun-Ping Chen, Zhewang Ma, Naoki Nagaoka, and Tetsuo Anada, "Synthesis of Ultra- Wideband Bandpass Filter Employing Parallel Coupled SIRs of One-Wavelength," Proceedings of the 37th European Microwave Conference, EuMC42-4, pp.787-790, Oct. 2007.
- Yoshio Kobayashi, Hiroshi Nakai, Fumio Suzuki, and Zhewang Ma, "Frequency and Temperature Dependence Measurements of Complex Permittivity of Dielectric Bars Using Some TM0m0 Modes in a Circular Cavity," 2007 Asia-Pacific Microwave Conference Proceedings, vol.1, pp. 383-386, Dec. 2007.
- Chun-Ping Chen, Zhewang Ma, Naoki Nagaoka, Kohei Sugawara, and Tetsuo Anada, "Novel Compact Ultra-Wideband Bandpass Filter Employing Short-circuited Stubs with Coupled Stepped-Impedance Resonator," 2007 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1175-1178, Dec. 2007.
- Zhewang Ma, Peng Cai, Yoshio Kobayashi, Masanobu Hiramoto, and Hitoshi Kanzaki, "A Millimeter-Wave UWB BPF Using Novel Microstrip Dual-Mode Ring Resonators with Stepped-Impedance Coupling Stuctures," 2007 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1183-1186, Dec. 2007.
- Ryosuke Tatsumi, Chun-Ping Chen, Tetsuo Anada, and Zhewang Ma, "Parabolic Equation Method for Calculating Leaky Mode Propagation in 2D/3D Multilayer Dielectric Waveguide," 2007 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1437-1440, Dec. 2007.
- Kohei Sugawara, Chun-Ping Chen, Zhewang Ma, Tetsuo Anada, and D.W.P. Thomas, "Non-contacting Electric and Magnetic Field Probe for Measuring EM Fields on Microwave Planar Circuits," 2007 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1441-1444, Dec. 2007.

- Z. Ma, T. Kawaguchi, Y. Kobayashi, D. Koizumi, K. Satoh, and S. Narahashi, “A Novel Compact HTS Interdigital Bandpass Filter Using CPW Quarter-Wavelength Resonators,” IEICE Trans. Electron., vol. E89-C, pp. 140-144, Feb. 2006.
- X. Guan, Z. Ma, P. Cai, Y. Kobayashi, T. Anada, and G. Hagiwara, “Synthesis of Dual-Band Bandpass Filters Using Successive Frequency Transformations and Circuit Conversions,” IEEE Microwave and Wireless Components Letters, vol. 16, no. 3, pp. 110-112, Mar. 2006.
- X. Guan, Z. Ma, P. Cai, Y. Kobayashi, T. Anada, and G. Hagiwara, “Synthesizing a Compact Microstrip Dual-Band Bandpass Filter Using Frequency Transformation and Circuit Conversion Technique ,” IEICE Trans. Electron., vol. E89-C, No. 4, pp. 495-502, Apr. 2006.
- W.Hu, Z. Ma, Y. Kobayashi, T. Anada, and G. Hagiwara, “Dual-Mode Bandpass Filters Using Microstrip Slotted Equilateral Triangular Patch Resonators,” IEICE Trans. Electron., vol. E89-C, No. 4, pp. 503-508, Apr. 2006.
- X. Guan, Z. Ma, P. Cai, T. Anada, and G. Hagiwara, “A Two-Pole 900/1800-MHz Microstrip Filter for Dual-Band Applications, “Microwave and Optical Technology Letters, John Wiley, vol. 48, No. 7, pp. 1388-1391, July 2006.
- P. Cai, Z. Ma, X. Guan, T. Anada, and G. Hagiwara, “Synthesis and Realization of Ultra-wideband Bandpass Filters Using the Z-transform Technique,” Microwave and Optical Technology Letters, John Wiley, Vol. 48, No. 7, pp. 1398-1401, July 2006.
- J. Mo, W. Liu, and Z. Ma, “A Novel Microstrip Lowpass Filter Having Two Transmission Zeros to Get Sharp Attenuation and Wide Stopband,” Microwave and Optical Technology Letters, John Wiley, Vol. 48, No. 11, pp. 2253-2256, Nov. 2006.
- P. Cai, Z. Ma, X. Guan, Y. Kobayashi, and T. Anada, “Novel Compact Microstrip Dual-Mode Ring Resonator Wideband Bandpass Filter with Significantly Improved Stopband Property,” IEICE Trans. Electron., vol. E89-C, No. 12, pp. 1858-1864, Dec. 2006.
- C. Chen, Y. Dong, M. Niu, D. Xu, Z. Ma, and T. Anada, “In-Situ Measurement of Complex EM Parameters of Dispersive Absorbing Materials by Coaxial-Probe-Based Frequency-Variation Method,” IEICE Trans. Electron., vol. E89-C, No. 12, pp. 1912-1919, Dec. 2006.
- X. Guan, Z. Ma, C. Chen, G. Zheng, and T. Anada, “Microstrip Dual-Band Bandpass Filter Using Slow-Wave Resonators for WLAN Applications,” Microwave and Optical Technology Letters, John Wiley, Vol. 49, No. 1, pp. 14-16, Jan. 2007.
- W. Liu, Z. Ma, C. Chen, G. Zheng, and T. Anada, “A Novel Ultra Wideband Bandpass Filter Using Microstrip Double-Ring Resonators,” Microwave and Optical Technology Letters, John Wiley, Vol. 49, No. 2, pp. 303-305, Feb. 2007.
- P. Cai, Z. Ma, C. Chen, G. Zheng, and T. Anada, “A Compact and Low-Loss Sub-Millimeter-Wave Ultra-Wideband Bandpass Filter,” Microwave and Optical Technology Letters, John Wiley, Vol. 49, No. 2, pp. 481-484, Feb. 2007.
- X. Guan, Z. Ma, C. Chen, and T. Anada, “Design of Microstrip Dual-Band Bandpass Filter with Controllable Bandwidth,” Microwave and Optical Technology Letters, John Wiley, Vol. 49, No. 3, pp. 740-742, Mar. 2007.
- Z. Ma, T. Kawaguchi, Y. Kobayashi, D. Koizumi, K. Satoh, and S. Narahashi, “A Miniaturized High Temperature Superconducting Bandpass Filter Using CPW Quarter-Wavelength Spiral Resonators,” 2006 IEEE MTT-S Int. Microwave Sym. Dig., WEPJ-5, pp. 1197-2000, June 2006.(San Francisco, CA)
- C. Chen, Z. Ma, T. Anada, and J. Hsu, “Determination of Absorbing Materials’ Complex EM-parameters via Scalar Reflectometer,” Progress In Electromagnetics Research Symposium (PIERS), pp. 88, August2-5, 2006. (Tokyo)
- R. Tatsumi, C. Chen, T. Anada, and Z. Ma, ”Semi-vectorial Beam Propagation Method for Calculating Wave Propagation Properties of Multilayer Dielectric Waveguide,” 2006 China-Japan Joint Microwave Conference Proceedings, vol.1, pp. 58-61, Aug. 2006, Chendu, China. (Aug. 23-25)
- P. Cai, Z. Ma, X. Guan, and G. Zheng, “Compact Microstrip Dual-Mode Ring Resonator Wideband Bandpass Filter with Reduced Return Loss and Widened Stopbands,” 2006 China-Japan Joint Microwave Conference Proceedings, vol. 1, pp. 162-165, Aug. 2006, Chendu, China. (Aug. 23-25)
- C.P. Chen, N. Nagaoka, T. Anada, K. Li, Z. Ma, and C. Christopoulos, “Near Electric Field in Microstrip/Coplanar Circuits and Antennas -Simulation and Measurement-,” 2006 IEEE Int. Sym. On Electromagnetic Compatability Dig., TU-PM-II-2, Aug. 2006.(Portland, Oregon, USA)
- C.P. Chen, Z. Ma, T. Anada, J.P. Hsu and C. Christopoulos, “In-situ Broadband Characterization of Complex Permittivity and Permeability of Magnetic Dispersive Materials,” International Symposium on Electromagnetic Compatibility (EMC Europe), pp. 341-346, September 4 - 8, 2006 Barcelona, Spain.
- C. Chen, Zhewang Ma, T. Anada and C. Christopoulos, “Scalar Reflectometer Based Nondestructive Technique for Measuring Complex Permittivity and Permeability,” Proceedings of the 36th European Microwave Conference, pp. 913-916, 10-15 Sept., 2006, Manchester, UK.
- H. Kawabata, K. Hasuike, Y. Kobayashi, and Z. Ma, “"Multi-Frequency Measurements of Complex Permittivity of Dielectric Plates using Higher-Order Modes of a Balanced-Type Circular Disk Resonator", Proceedings of the 36th European Microwave Conference, pp. 388-391, 10-15 Sept., 2006, Manchester, UK.
- P. Cai, Z. Ma, X. Guan, G. Zheng, and T. Anada, “A Novel Sub-Millimeter-Wave UWB Filter,” Conference Digest of the 2006 Joint 31st International Conference on Infrared and Millimeter Waves and 14th International Conference on Terahertz Electronics (IRMMW-THz 2006), pp. 240, Sept. 18-22, 2006, Shangahai, China.
- W. Liu, Z. Ma, C.-P.Chen, G. Zheng and T. Anada, “A Novel UWB Filter Using a New Type of Microstrip Double-Ring Resonators,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.1, pp. 33-36, WE1B-3, Dec. 2006.
- P. Cai, Z. Ma, X. Guan, Y. Kobayashi, T. Anada, and G. Hagiwara, “Synthesis and Realization of Novel Ultra-Wideband Bandpass Filters Using 3/4 Wavelength Parallel-Coupled Line Resonators,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.1, pp. 159-162, WE3B-3, Dec. 2006.
- P. Cai, Z. Ma, X. Guan, Y. Kobayashi, T. Anada, and G. Hagiwara, “Compact Millimeter-Wave Ultra-Wideband Bandpass Filter Using Dual-Mode Ring Resonator and Multiple-Mode Parallel-Coupled Line Structure,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.1, pp. 163-166, WE3B-4, Dec. 2006.
- X. Guan, Z. Ma, P. Cai, D. Xu, T. Anada, and G. Hagiwara, “Novel Compact Dual-Band Bandpass Filter with Improved Stopband Characteristics,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.2, pp. 1169-1172, THOF-05, Dec. 2006.
- Z. Ma, K. Kikuchi, Y. Kobayashi, T. Anada*, and G. Hagiwara, “Novel Microstrip Dual-Band Bandstop Filter with Controllable Dual-Stopband Response,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.2, pp. 1177-1180, THOF-07, Dec. 2006.
- H. Kawabata, T. Kobayashi, Y. Kobayashi, and Z. Ma, “Measurement Accuracy of a TM0m0 Mode Cavity Method To Measure Complex Permittivity of Rod Samples,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1465-1468, FR1C-5, Dec. 2006.
- H. Miki, Z. Ma, and Y. Kobayashi, “A Novel Bandpass Filter with Sharp Attenuations and Wide Stopband Developed Through the Combined Use of Composite Resonators and Stepped Impedance Resonators ,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1683-1686, FR3B-3, Dec. 2006.
- Z. Ma, T. Shimizu, Y. Kobayashi, T. Anada, and G. Hagiwara, “Novel Compact Dual-Band Bandpass Filters Using Composite Resonators to Obtain Separately Controllable Passbands,” 2006 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1814-1817, FR4B-4, Dec. 2006.
- Z. Ma and Y. Kobayashi, “Novel Design and Implementation Methods of High-Performance RF/Microwave Planar Filters Using Composite Resonators (Invited),” 2006 Asia-Pacific Microwave Conference Proceedings, vol.3, pp. 1818-1823, FR4B-5, Dec. 2006.

- Y.Mu, Z.Ma, and D.Xu, “A Novel Compact Interdigital Bandpass Filter Using Multilayer Cross-Coupled Folded Quarter-Wavelength Resonators,” IEEE Microwave and Wireless Components Letters, vol. 15, no. 12, pp. 847-849, Dec. 2005.
- P.Cai, Z.Ma, X.Guan, Y.Kobayashi, T.Anada, and G.Hagiwara,, “A Compact UWB Bandpass Filter Using Two-Section Open-Circuited Stubs to Realize Transmission Zeros,” 2005 Asia-Pacific Microwave Proceedings, pp. 3356-3359, Dec. 2005.
- Z.Ma, T.Kawaguchi, Y.Kobayashi, D.Koizumi, K.Satoh, S.Narahashi, “A Novel Compact High Temperature Superconducting CPW Bandpass Filter, 2005 Asia-Pacific Microwave Proceedings, pp. 2423-2426, Dec. 2005.
- C.P.Chen, Z.Ma, T.Anada, J.P.Hsu, and D.Xu, “Nondestructive and Simultaneous Measurement of Complex EM Parameters with Scalar Reflectometer,” 2005 Asia-Pacific Microwave Proceedings, pp. 2382-2385, Dec. 2005.
- Y.Mu, Z.Ma, and D.Xu, “Multilayered Stripline Interdigital-Hairpin Bandpass Filters with Small-Size and Improved Stopband Characteristics,” 2005 Asia-Pacific Microwave Proceedings, pp. 2306-2309, Dec. 2005.
- X.Guan, Z.Ma, P.Cai, G.Li, Y.Kobayashi, T.Anada, and G.Hagiwara, “A Dual-Band Bandpass Filter Synthesized by Using Frequency Transformation and Circuit Conversion Technique,” 2005 Asia-Pacific Microwave Proceedings, pp. 2294-2297, Dec. 2005.
- P.Cai, X.X.Yang, Z.Ma, and W.Jun Zhang, “Analysis of the Stability of High-Order FDTD(2,4) Algorithm,” 2005 Asia-Pacific Microwave Proceedings, pp. 1791-1794, Dec. 2005.
- X.Guan, G.Li, and Z.Ma, “Optimized Design of a Low-Pass Filter Using Defected Ground Structures,” 2005 Asia-Pacific Microwave Proceedings, pp. 481-484, Dec. 2005.
- W.Hu, Z.Ma, D.Xu, Y.Kobayashi, T.Anada, and G.Hagiwara, “Microstrip Bandpass Filters Using Degenerate Dual-Modes of Slotted Equilateral Triangular Patch Resonators,” 2005 Asia-Pacific Microwave Proceedings, pp. 454-457, Dec. 2005.
- Z.Ma and Y.Kobayashi, “Design and Realization of Bandpass Filters Using Composite Resonators to Obtain Transmission Zeros,” 35th European Microwave Conference (EuMC) Proc., pp. 1255-1258, Oct. 2005.
- T. Hiraoka, C.P.Chen, T.Anada, J.P.Hsu, Z.Ma, and C.Christopoulos, “Electric Field Distribution in Microwave Planar Circuits by Small Coaxial Probe and Comparison with FDTD Method,” 35th European Microwave Conference (EuMC) Proc., pp. 1071-1074, Oct. 2005.
- C.P.Chen, Z.Ma, T.Anada, and J.P.Hsu, “Further Study on Two-Thickness-Method for Simultaneous Measurement of Complex EM Parameters Based on Open-ended Coaxial Probe,” 35th European Microwave Conference (EuMC) Proc., pp. 505-508, Oct. 2005. (Paris, France)
- Z.Ma, J.Mo, and G.Hagiwara, “A Novel Compact Microstrip Lowpass Filter with Two Transmission Zeros,” Proceeding of the 10th International Symposium on Microwave and Optical Technology (ISMOT-2005), pp.803-806, August 2005.
- C.Chen, Z.Ma, T.Anada, J.P.Hsu, and D.Xu, “Error Sources in Open-ended Coaxial Probe Techniques for Simultaneous Complex EM Parameters Characterization,” Proceedings of the 7th International Conference on Electronic Measurement and Instruments (ICEMI’2005), pp. 705-709, August 2005.
- Z.Ma and Y.Kobayashi, “Miniaturized High-Temperature Superconducting Microstrip and Coplanar Waveguide Filters (INVITED),” IEICE Trans. Electron., vol.E88-C, No.7, pp. 1406-1411, July 2005.
- Z.Ma, E.Sakurai and Y.Kobayashi, "Design and measurement of a miniaturized HTS filter using microstrip spiral resonators," IEICE Trans. Electron., Vol. E88-C, No. 2, pp.216-220, Feb. 2005.
- Z.Ma, K.Nomiyama and Y.Kobayashi, "Microstrip lowpass filters with reduced size and improved stopband characteristics," IEICE Trans. Electron., Vol. E88-C, No. 1, pp.62-67, Jan. 2005.
- Z.Ma, T.Kawaguchi and Y.Kobayashi, "Miniaturized high-temperature superconductor bandpass filters using microstrip S-type spiral resonators," IEICE Trans. Electron., Vol. E88-C, No. 1, pp.57-61, Jan. 2005.

- T. Kawaguchi and Y. Kobayashi, "A novel equivalent circuit expression for electromagnetic coupling between distributed line resonators," 34th European Microwave Conf. Proc., pp.629-632, Oct. 2004.
- H. Kawabata, H. Tanpo and Y. Kobayashi, “Analysis and experiments of a TM010 mode cylindrical cavity to measure accurate complex permittivity of liquid”, IEICE Trans. Electron., Vol. E87-C, No. 5, pp.694-699, May 2004.
- T. Shimizu and Y. Kobayashi, “Cut-off circular waveguide method for dielectric substrate measurements in millimeter wave range”, IEICE Trans. Electron., Vol. E87-C, No. 5, pp.672-680, May 2004.
- T. Hashimoto and Y. Kobayashi, “Two-sapphire-rod-resonator method to measure the surface resistance of high-Tc superconductor films”, IEICE Trans. Electron., Vol. E87-C, No. 5, pp.681-688, May 2004.

- H. Kawabata, H. Tanpo and Y. Kobayashi, “An improved of the perturbation method using a TM010 mode cylindrical cavity”, IEICE Trans. Electron., VOL. E86-C, No. 12, pp. 2371-2378, Dec. 2003.
- H. Kawabata, H. Tanpo and Y. Kobayashi, “An improvement of perturbation method for the complex permittivity measurements of liquids”, 2003 Asia-Pacific Microwave Conf. Proc., vol. 1, WEP-65, pp. 576-579, Nov. 2003.
- Y. Kobayashi, “Recent progress in microwave and millimeter wave measurement methods of low loss dielectric materials and HTS films”, 2003 Asia-Pacific Microwave Conf. Proc., vol. 2, TC3-1, pp. 917-920, Nov. 2003.
- Z. Ma, T. Kawaguchi and Y. Kobayashi, “Miniaturized bandpass filters using microstrip S-type spiral resonators”, 2003 Asia-Pacific Microwave Conf. Proc., vol. 3, FE5-1, pp. 2004-2007, Nov. 2003.
- T. Shimizu, T. Nishino and Y. Kobayashi, "Some discussions of the resonator structure for the cut-off waveguide method and the round robin test," 33rd European Microwave Conf. Proc., P2-39, pp.755-758, Oct. 2003.
- H. Kawabata, H. Tanpo and Y. Kobayashi, "A rigorous analysis of a TM010 mode cylindrical cavity to measure accurate complex permittivity of liquid," 33rd European Microwave Conf. Proc., P2-40, pp.759-762, Oct. 2003.
- Y. Kobayashi, T. Hashimoto and T. Shimizu, “Possibility of millimeter-wave HTS filters”, 2003 European Conf. on Applied Superconductivity Poster, book of abstracts, pp.63-64, Sep. 2003.
- Z. Ma, T. Asano and Y. Kobayashi, “Theory for the design of a filter having one cross coupling path to realize transmission zeros”, IEICE Trans. Electron., Vol. E86-C, No. 8, pp. 1690-1698, Aug. 2003.
- Z. Ma and Y. Kobayashi, “On the error of the unloaded Q-factor of a transmission-type resonator measured by the insertion loss method and the return loss method”, IEICE Trans. Electron., Vol. E86-C, No. 8, pp. 1672-1677, Aug. 2003.
- T. Shimizu, Z. Ma and Y. Kobayashi, "Design of a grooved circular cavity for dielectric substrate measurements in millimeter wave region," IEICE Trans. Electron., Vol. E86-C, No. 8, pp.1715-1720, Aug. 2003.
- T. Hashimoto and Y. Kobayashi, "Frequency dependence measurements of surface resistance of superconductors using four modes in a sapphire rod resonator," IEICE Trans. Electron., VOL. E86-C, No. 8, pp.1721-1728, Aug. 2003.
- Z. Ma, "Design and diagnosis of a 5GHz 10-pole HTS bandpass filter using CPW quarter-wavelength resonators," IEICE Trans. Electron., Vol. E86-C, No. 2, pp.144-149, Feb. 2003.
- T. Hashimoto and Y. Kobayashi, "An image-type dielectric resonator method to measure surface resistance of a high-Tc superconductor film," IEICE Trans. Electron., Vol. E86-C, No. 1, pp.30-36, Jan. 2003.

- T. Shimizu, Z. Ma and Y. Kobayashi, "Design of a grooved circular cavity for separating degenerate TE and TM modes in dielectric substrate measurements," 2002 Asia-Pacific Microwave Conf. Proc., No. TH4D-5, pp. 1019-1022 Nov. 2002.
- H. Kawabata, Hiroshi Tanpo and Y. Kobayashi, "An improved perturbation method using a TM010 mode cylindrical cavity," 2002 Asia-Pacific Microwave Conf. Proc., No. TH4D-2, pp. 1007-1010, Nov. 2002.
- Z. Ma, E. Sakurai, Kaneo Nomiyama and Y. Kobayashi, "Design and measurement of a miniaturized high temperature superconductor microstrip spiral resonator filter," 2002 Asia-Pacific Microwave Conf. Proc., No. WE3D-3, pp. 211-214, Nov. 2002.
- T. Hashimoto and Y. Kobayashi, "Measurements of frequency dependence of surface resistance of HoBCO films using four modes in a sapphire rod resonator," 2002 Asia-Pacific Microwave Conf. Proc., No. WE3D-1, pp. 203-206, Nov. 2002.
- Y. Kobayashi, "Microwave measurements of HTS films and dielectric substrates for HTS filter designs," 2002 Asia-Pacific Microwave Conf. Workshop Dig., No. WS10-2, pp. 352-361, Nov. 2002.
- Z. Ma, E. Sakurai, Kaneo Nomiyama, and Y. Kobayashi, "A 1.93 GHz Microstrip Spiral Resonator Bandpass Filter," 2002 Korea-Japan Microwave Workshop (KJMW2002), pp. 105-108, Oct. 2002.
- T. Shimizu and Y. Kobayashi, "Millimeter wave measurements of some low-loss dielectric plates by a novel cut-off circular waveguide method," 32nd European Microwave Conf. Proc., pp. 825-828, Sep. 2002.
- T. Hashimoto and Y. Kobayashi, "A novel technique to measure frequency dependence of surface resistance of YBCO films using some modes in a sapphire rod resonator," 32nd European Microwave Conf. Proc., pp. 263-266, Sep. 2002.
- Z. Ma, H. Suzuki, and Y. Kobayashi, "Design and Diagnosis of a 5GHz 10-pole HTS Bandpass Filter Using CPW Quarter-Wavelength Resonators," 2002 3rd International Conference on Microwave and Millimeter Wave Technology Proceedings (ICMMT2002), pp. 279-282, Aug. 2002.
- T. Hashimoto and Y. Kobayashi, "Design of sapphire rod resonators to measure the surface resistance of high temperature superconductor films," 2002 IEEE MTT-S Int. Microwave Symp. Digest, No.TH4E-6, pp.1975-1978, Jun. 2002.
- Z. Ma and Y. Kobayashi, "A low-loss 5GHz bandpass filter using HTS coplanar waveguide quarter-wavelength resonators," 2002 IEEE MTT-S Int. Microwave Symp. Digest, No.TH4E-3, pp.1967-1970, Jun. 2002.
- Z. Ma and Y. Kobayashi, "Error analysis of the unloaded Q-factors of a transmission-type resonator measured by the insertion loss method and the return loss method," 2002 IEEE MTT-S Int. Microwave Symp. Digest, No.TH2E-2, pp.1661-1664, Jun. 2002.
- H. Suzuki, Z, Ma, Y. Kobayashi, K. Satoh, S. Narahashi and T. Nojima,"A low-loss 5 GHz bandpass filter using HTS quarter-wavelength coplanar waveguide resonators," IEICE Trans. Elec., Vol. E 85-C, No. 3, pp.714-719, Mar. 2002.
- T. Hashimoto and Y. Kobayashi,"Development of a millimeter-wave coaxial cable measurement system at cryogenic temperature and measurement of the surface resistance of high-Tc superconductor films.," IEICE Trans. Elec., Vol. E85-C, No. 3, pp.714-719, Mar. 2002.
- T. Shimizu, and Y. Kobayashi, "Measured results of some low-loss dielectric plates by cut-off circular waveguide method in millimeter wave region ," 2002 Topical Symposium on Millimeter Waves. Digest, P-17,pp.191-194, Mar. 2002.

- H. Kawabata and Y. Kobayashi,"The analysis of a balanced-type circular disk resonator excited by coaxial cable lines to measure the complex permittivity," 2001 Asia-Pacific Microwave Conf. Proc., pp.1322-1325, Dec. 2001.
- Z. Ma and Y. Kobayashi,"Measurement of the unloaded Q-factor of a transmission-type microwave resonator having two coupled modes," 2001 Asia-Pacific Microwave Conf. Proc., pp.1235-1238, Dec. 2001.
- Z. Ma and Y. Kobayashi,"Theory for the design of a filter having one cross coupling path to realize poles of attenuation in its stop band," 2001 Asia-Pacific Microwave Conf. Proc., pp.519-522, Dec. 2001.
- H. Kawabata and Y. Kobayashi,"The rigorous analysis for a new structure of a balanced-type circular disk resonator excited by coaxial cable lines," Proc. 2001 Progress in Elecromagnetics Research Symposium (PIERS 2001), pp.617, Jul. 2001.
- H. Suzuki, Z. Ma, Y. Kobayashi, K. Satoh, S. Narahashi, and T. Nojima, "Design of a 5GHz band pass filter using HTS quarter-wavelength coplanar waveguide resonators," Proc. 2001 Progress In Electromagnetics Research Symposium (PIERS 2001), p. 455, Jul. 2001
- Z. Ma and Y. Kobayashi,"Analysis of dielectric resonators using the FDTD method combined with the pade interporation technique," IEICE Trans. Elec., Vol. E84-C, No.8, pp.973-976, Jul. 2001.
- T. Shimizu, and Y. Kobayashi, "Millimeter wave measurements of temperature dependence of complex permittivity of GaAs plates by a circular waveguide method," 2001 IEEE MTT-S Int. Microwave Symp. Digest, THIF-51, pp.2195-2198, Jun. 2001.
- Y. Kobayashi, and T. Hashimoto, "Design of an image-type dielectric resonator to measure surface resistance of a high-Tc superconductor film," 2001 IEEE MTT-S Int. Microwave Symp. Digest, TUIF-25, pp.495-498, Jun. 2001.
- T. Shimizu, and Y. Kobayashi, "50GHz measurements of temperature dependence of complex permittivity of dielectric plates by a cut-off circular waveguide method," 2001 Topical Symposium on Millimeter Waves. Digest, P-10, Mar. 2001.

- Y. Kobayashi, T. Hashimoto, H.Yoshikawa, "Millimeterwave measurements of surface resistance of HTS films by a dielectric resonator method," (Poster) Abstracts on Symp. On High-Temp superconductors in High Frequency Fields, pp. 58-58, May. 2000.
- Y. Kobayashi, "Research and development of HTS microwave devices in Japan," (Invited) Abstracts on Symp. On High-Temp superconductors in High Frequency Fields, pp. 35-35, May. 2000.
- Y. Kobayashi, Y. Nomiyama, H. Yoshikawa T. Hashimoto, "Surface resistance measurement of a YBCO film using two modes in an image-type dielectric resonator," Pre-Conf. Booklet on 2000 Applied Superconductivity Conf., 4MA05 Sept. 2000.
- Z. Ma, Y. Takiguchi, Y. Kobayashi, "Design of two types of millimeter wave filters using coplanar waveguide structures," 2000 Asia-Pacific Microwave Conf. Proc., pp. 516-519, Dec. 2000.
- Y. Kobayashi, H. Yoshikawa and T. Hashimoto, " Frequency dependence of measurement precision in two resonator method for estimating suface resistance of hifh-Tc superconductor films, " Proc. 2000 Asia-Pacific Microwave Conf. Proc., pp1567-1564, Dec. 2000.
- Y. Kobayashi, "Structures of HTS-sapphire resonators to measure very high Q," APMC2000 Workshop Proc., pp. 60-67, Dec. 2000.
- Y. Kobayashi, S. Suzuki, and T. Yoshitake, "Application of high-temperature superconductor materials to satellite communications," Space Japan Review, No.8, pp. 33-38, Dec. 1999/ Jan. 2000.

- Y. Kobayashi, T. Shimizu, "Millimeterwave measurements of temperature dependence of complex permittivity of dielectric plates by the cavity resonance method," 1999 IEEE MTT-S Int. Microwave Symp. Digest, pp.1885-1888. Jun. 1999.
- Y. Kobayashi, H. Ogawa, "Report of the 1998 Asia-Pacific Microwave Conference," IEEE MTT-S Newsletter, No. 152, pp.16-19, Summer 1999.
- Z. Ma, Y. Kobayashi, "FDTD analysis of dielectric resonators," Proc. 1999 Asia-Pacific Microwave Conf. (APMC'99), pp. 401-404, Dec. 1999.
- Z. Ma, Y. Kobayashi, "Analysis of axially cascaded dielectric resonators using the mode-matching method combined with the generalized scattering matrix technique," Proc. 1999 Asia-Pacific Microwave Conf. (APMC'99), pp. 848-851, Dec. 1999.
- Y. Kobayashi, "Superconductive filters," (Invited), JSPS-NUS Workshop on High Temperature Superconducting Thin Films and Devices, Dec. 1999.
- Y. Kobayashi, "Microwave and millimeter-wave measurements of dielectric materials by resonance methods of various types," MWE '99 Microwave Workshop Digest, WS5-2, pp. 155-160, Dec. 1999.

- H. Yoshikawa, S. Okajima and Y. Kobayashi, " Comparison between BMT ceramic one-resonator method and sapphire two-resonator method to measure surface resistance of YBCO films, " Proc. 1998 Asia-Pacific Microwave Conf. , No. WEOF87, pp. 1019-1022, Dec. 1998.
- Y. Kobayashi and H. Yoshikawa," Microwave measurements of surface impedance of high-Tc superconductors using two modes in a dielectric rod resonator," IEEE Trans. Microwave Theory Tech., Vol. 46, No. 12, pp. 2524-2530, Dec. 1998.
- Y. Kobayashi, "WS6-1: Japanese HTS microwave communication program," Digest of APMC '98 Workshop, WS6: Superconducting Microwave Applications to Mobile Communi-cations, pp. 3-10, Dec.8-11, 1998. (Yokohama)
- Y. Kobayashi and H. Yoshikawa, "A two-mode dielectric rod resonator method for measuring surface impedance of high-Tc superconductors," IEEE MTT-S Int. Microwave Symp. Digest Proc., No. WEIF-63, pp.1019-1022, June 1998.
- Y. Kobayashi, D. Yamaguchi, K. Saito, N. Sakakibara, Y. Ueno, S. Narahashi, and T. Nojima, "Design of a 264 MHz superconductive thin film Lumped element filter," Proc.1998 Asia-Pacific Microwave Conference (APMC '98), No. TH4D-4, pp.1513-1516, Dec. 1998.
- Z. Ma and Y. Kobayashi, "FDTD characterization of planar resonators with applications to the design of small-sized filters," Proc.1998 Asia-Pacific Microwave Conference (APMC '98), No. TU3B-3, pp.173-176, Dec. 1998.
- Z. Ma and Y. Kobayashi, "FDTD characterization of planar circular resonators with applications to the design of small-sized filters," 1998 Int. Conf. on Microwave and Millimeter Wave Technology Proc. (ICMMT '98), pp.974-977. Aug. 1998,.
- Y. Kobayashi, "Development trends of microwave high-Tc superconductor filters," (Invited) 1998 Int. Conf. on Microwave and Millimeter Wave Technology Proc. (ICMMT '98), pp.36-39, Aug. 1998.
- Y. Kobayashi, "Measurement of surface impedance of YBCO bulk plates using a two-mode dielectric rod resonator method," The 5th Symposium on High-Temperature Superconductors in High-Frequency Fields (HTS-nr 1998), (Poster Session). Jun. 1998.

- Y. Kobayashi, H. Yoshikawa and S. Ono, " Phenomenological description of microwave characteristics of low-Tc superconductor by three-fluid model.," IEICE Trans. Electronis, Vol. E80-C, No. 10, pp. 1269-1274, Oct. 1997.
- H. Yoshikawa, S. Ono and Y. Kobayashi, " Explanation of microwave surface impedance of a Nb film by three-fluid model," Proc. 1997 Asia-Pacific Microwave Conf., No. 2P01-8, pp. 129-132, Dec. 1997.
- Y. Kobayashi and H. Yoshikawa, "Automatic measurements of surface resistance of superconductors using two modes in a dielectric rod resonator," 27th EuMC Proc., pp. 703-708, Sept. 1997.